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l runovnmnr IN Mlrcmwzs PoR accusate @anni Mire.

- DAVID ninemsn; or oHAnLnScoN, sonirn vcAimLnm.

t aan@ Patent No. masse, amc Jayce, 1ero.`

cnusnmfmnnnsn AND OTHER HARD stm' -s'rANcns I I Y The Schedule referred to` in these Letters Patent and making part of thesame,

MOH-

To all whom u maycmwera." i

Beit known that L'DAvID C. EBAUGH, of Charles-v ton, in the YState of `South Oarolinzwhave invented 1 certain new and usefulimprovements in Machines for Crushing Mineral and other Ecard Substances and I do heresy declare the ibllowingto be a. full, clear, and exact description ofthe same, `freierence being had to the accompanying drawings'making a partof this specification, in whichfl )Figure 1- represents atop plan of the machine. r Figure representsan end. elevation, partly in sec- A l l .l Y. Y Figure 3 represeuts a side'elevanon, partly 1n -section.l Y 2 Similar letters" of reference, where they occur in 4the separate figures, denote. likeparts in 'all ot' the wears ont vthe parts, andl\clngs thedelivery of the crushed'|nater'ial, bntr-to mak``-t-he substance itself, by being forced one piece or part against anotherV piece 'or partgcrnsh, so as to pass through the openings in the hed orconcavc; and

'My. inventioncpnsists in" a revolving screwcylinder,' l

` ,the arms of which `spireidividelhoverlapf n (l'` run inv contrary directions, ll'ointhe center towar tlieends thereof; and turning in a perforated concave, so that the material, as itis crushed, shall drop through said. -perfinations To enable others skilled in thefart to make-and use iny inventiom-Iwvill proceed to.,desciihe\the same, in" connection with the drawings.

` i In afname, A, is made a concave, composed of a series of ribs, into whichis let, ajseries of transf verse slats, 0,"so as to h e l'lnsh with the concave edges v 'of 4the ribs, and'thns form a series 'of'oblongl flaringl openings", a, in said concave,'the whole being/formed' Aof iron, or of ziron and steel, or other suitable n1etal,n l and over thefrarne and concave is `nl ade, a hopjper, into which the lnaterialto he crushed 1s thrown.

u l :In 4suitable bearings in the endsot the frame ,or

` concaveare supported the journals D ot" a'v revolving seretir-cylinder,` E, which may` be driven 'hy anyifirst moving powen,` by hel't'or gearing gagnent' the gone nais, or the shaft` of said cylinder, so asto turn over the-slotted or perforated bottom ofthe concave, but not close tu it, leavingr space enonghbetween the cylinder and concave for the material to be crushed to work or bc drawn tinto.

The cylinder -E has two sets of spiral or sectional rect-ions, and breaking joint with each other at the center in length of the cylinder; also, 0\,'erlappin'` f each other vat the center, as at e. The object oi' he\ -two sets of spirals or: sectional threads is to prev .nt

` the-material' beingfcrhshed from -crovlirgtoward the' 4center o f the cohca\"e,and theobject of overlapping the spirals at the center, as at e, is that any material passing from one seti of -arlns orv screws to another, will be broken or crushed by passing or being forced through'this contractcil space. The working-edges oi' the spirals or screw-threads may he faced with steel; and the-slats O, when worn, mayV be ireverscd vin .their bearing-ribs, so as to present new and true edges. l i ',lhe cylinder need notbe concentric with the con- `care, but, as shown in fig. 2,-set valittle'to one side, so las to allowthe material to be cl-'nshed to pass `in and down 'under the cylinder, which, as there shown, rev

volves sufficiently far from-theconcave to allow enough material in the space,"V to cause one piece o r 'part to be crushed against ori by .another piece or part, and

line enough to drop-throngh theopenngs a of the concave, which are of less cross arca than that of thev s space in which the crushing is done, and thus save much'of the wear of fthe metal,by makingthemate rial. act so astocrnsh itself, one pieceagainstanother.

, hat I claim as my invention in a crushing-machine isi 5in combination with a s latted openfbottmned] concave, a revolving cylinder, haring twosetsof spiralv threads or flanges yrunning in opposite'directions, breaking joint and overlapping at the center of the cylinder,.a nd turning slightly' 'above thefbott'om' f the concave, inthe mannerand'for the pnl-pose (lesbi-ined., and represented-.x g", l 1), D, O. ,EBAUGE .Witnessesz I A. WA. B. S'ronen'rozc Rom'. Boon-n. 

